| 摘要 |
<p>A surface acoustic wave filter (10) includes a Y-cut X-propagation LiTaO3 substrate (20) having a cut angle of about 38 degrees to about 46 degrees, at least first and second series arm surface acoustic wave resonators (11a,11b) connected in series to define a series arm, and at least one parallel arm surface acoustic wave resonator (12a-c) connected to the series arm. Each of the first and second series arm surface acoustic wave resonators (11a,11b) includes an interdigital transducer having a plurality of pairs of electrode fingers, and where the number of pairs of electrode fingers of the first series arm surface acoustic wave resonator (11a) is represented by N (N = natural number), the corresponding number for the second series arm surface acoustic wave resonator (11b) differs from n x N (n = natural number). <IMAGE></p> |
